ELECTRIC

CURRENT

Mr. Charges Journey

PROBLEM #1The amount of charge that passesthrough the filament of a certainlight bulb in 2 seconds is 1.67 C.A) What is the current in the lightbulb?B) What is the number of electronsthat pass through the filament inone second? Q 1.67A) I 0.835 A t 2

B) In 2 s 1.67 C of charge passes

In 1 s : 0.835C of charge willpass 1e 0.835C 1.6 10 C -19

5.22 10 electrons 18 PROBLEM #2

1 x 1020 electrons flow through a

conductor in 3 s.A) What is the charge flowingthrough the conductor?B) What is the current in thecircuit?A) # e 1 10 20 e 19 1.6 10 C Q 1 10 e 20

1e Q 16C t 3s

B) I Q 16C 5.33 A t 3s PROBLEM #3

How many electrons pass a

point in 5 s if a constantcurrent of 8 A is maintained ina conductor? I 8A Q? t 5s Q I tQ I t 8 5 1e# 40C 2.5 10 20 e 1.6 10 19 PROBLEM #4The amount of charge that passesthrough the filament of a certainlight bulb in 2 seconds is 12C.A) What is the current in the lightbulb?B) What is the number of electronsthat pass through the filament inone second? Q 12A) I 6A t 2

How much does it cost to

A small electric furnace that expends 2

kW of power is connected across apotential difference of 120 V.A) What is the current in the circuit?B) What is the resistance of the furnace?C) What is the cost of operating thefurnace for 24 hours at 7 cents per kWh?A) P 2kW V 120V P 2000W I 16.7 A V 120V V 120V R 7.18 I 16.7 A